content: Implement dynamic priorities for raster threads.

cc/raster/tile_task_runner.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_RASTER_TILE_TASK_RUNNER_H_
 #define CC_RASTER_TILE_TASK_RUNNER_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 16 matching lines @@
       uint64_t previous_content_id) = 0;
   virtual void ReleaseBufferForRaster(scoped_ptr<RasterBuffer> buffer) = 0;
 
  protected:
   virtual ~TileTaskClient() {}
 };
 
 class CC_EXPORT TileTask : public Task {
  public:
   typedef std::vector<scoped_refptr<TileTask>> Vector;
-
   virtual void ScheduleOnOriginThread(TileTaskClient* client) = 0;
   virtual void CompleteOnOriginThread(TileTaskClient* client) = 0;
 
   void WillSchedule();
   void DidSchedule();
   bool HasBeenScheduled() const;
 
   void WillComplete();
   void DidComplete();
   bool HasCompleted() const;
@@ skipping 55 matching lines @@
   // Determine if the resource requires swizzling.
   virtual bool GetResourceRequiresSwizzle(bool must_support_alpha) const = 0;
 
  protected:
   virtual ~TileTaskRunner() {}
 };
 
 }  // namespace cc
 
 #endif  // CC_RASTER_TILE_TASK_RUNNER_H_